MULTI-EPOCH MULTI-FREQUENCY VLBI STUDY OF THE PARSEC-SCALE JET IN THE BLAZAR 3C 66A
ABSTRACT We present observational results of the γ-ray blazar 3C 66A at 2.3, 8.4, and 22 GHz at four epochs during 2004-2005 with the VLBA. The resulting images show an overall core-jet structure extending roughly to the south, with two intermediate breaks occurring in the region near the core. By m...
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| Veröffentlicht in: | The Astronomical journal 2015-02, Vol.149 (2), p.1-7 |
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| creator | Zhao, Guang-Yao Chen, Yong-Jun Shen, Zhi-Qiang Sudou, Hiroshi Iguchi, Satoru |
| description | ABSTRACT We present observational results of the γ-ray blazar 3C 66A at 2.3, 8.4, and 22 GHz at four epochs during 2004-2005 with the VLBA. The resulting images show an overall core-jet structure extending roughly to the south, with two intermediate breaks occurring in the region near the core. By model-fitting to the visibility data, the northmost component, which is also the brightest, is identified as the core according to its relatively flat spectrum and its compactness. Combining our results with previous results to investigate the proper motions of the jet components, we found the kinematics of 3C 66A to be quite complicated, with components of inward and outward, subluminal and superluminal motions all detected in the radio structure. The superluminal motions indicate strong Doppler boosting exists in the jet. The apparent inward motions of the innermost components last for at least 10 years and could not be caused by newborn components. A possible reason could be non-stationarity of the core due to opacity change. |
| doi_str_mv | 10.1088/0004-6256/149/2/46 |
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The resulting images show an overall core-jet structure extending roughly to the south, with two intermediate breaks occurring in the region near the core. By model-fitting to the visibility data, the northmost component, which is also the brightest, is identified as the core according to its relatively flat spectrum and its compactness. Combining our results with previous results to investigate the proper motions of the jet components, we found the kinematics of 3C 66A to be quite complicated, with components of inward and outward, subluminal and superluminal motions all detected in the radio structure. The superluminal motions indicate strong Doppler boosting exists in the jet. The apparent inward motions of the innermost components last for at least 10 years and could not be caused by newborn components. A possible reason could be non-stationarity of the core due to opacity change.</description><identifier>ISSN: 0004-6256</identifier><identifier>ISSN: 1538-3881</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.1088/0004-6256/149/2/46</identifier><language>eng</language><publisher>United States: The American Astronomical Society</publisher><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Blazars ; Breaking ; COSMIC GAMMA SOURCES ; Doppler ; DOPPLER EFFECT ; Flats ; GALAXIES ; galaxies: individual (3C 66A) ; galaxies: jets ; GHZ RANGE ; Kinematics ; OPACITY ; PROPER MOTION ; radio continuum: galaxies ; SPECTRA ; VISIBILITY</subject><ispartof>The Astronomical journal, 2015-02, Vol.149 (2), p.1-7</ispartof><rights>2015. The American Astronomical Society. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c452t-774b33ca976ee3a638bf77ef95c6005ef74d87a849534e148ac62586896510413</citedby><cites>FETCH-LOGICAL-c452t-774b33ca976ee3a638bf77ef95c6005ef74d87a849534e148ac62586896510413</cites><orcidid>0000-0002-4417-1659</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/0004-6256/149/2/46/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,776,780,881,27901,27902,38845,38867,53815,53842</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.1088/0004-6256/149/2/46$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/22342139$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Zhao, Guang-Yao</creatorcontrib><creatorcontrib>Chen, Yong-Jun</creatorcontrib><creatorcontrib>Shen, Zhi-Qiang</creatorcontrib><creatorcontrib>Sudou, Hiroshi</creatorcontrib><creatorcontrib>Iguchi, Satoru</creatorcontrib><title>MULTI-EPOCH MULTI-FREQUENCY VLBI STUDY OF THE PARSEC-SCALE JET IN THE BLAZAR 3C 66A</title><title>The Astronomical journal</title><addtitle>AJ</addtitle><addtitle>Astron. J</addtitle><description>ABSTRACT We present observational results of the γ-ray blazar 3C 66A at 2.3, 8.4, and 22 GHz at four epochs during 2004-2005 with the VLBA. The resulting images show an overall core-jet structure extending roughly to the south, with two intermediate breaks occurring in the region near the core. By model-fitting to the visibility data, the northmost component, which is also the brightest, is identified as the core according to its relatively flat spectrum and its compactness. Combining our results with previous results to investigate the proper motions of the jet components, we found the kinematics of 3C 66A to be quite complicated, with components of inward and outward, subluminal and superluminal motions all detected in the radio structure. The superluminal motions indicate strong Doppler boosting exists in the jet. The apparent inward motions of the innermost components last for at least 10 years and could not be caused by newborn components. A possible reason could be non-stationarity of the core due to opacity change.</description><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Blazars</subject><subject>Breaking</subject><subject>COSMIC GAMMA SOURCES</subject><subject>Doppler</subject><subject>DOPPLER EFFECT</subject><subject>Flats</subject><subject>GALAXIES</subject><subject>galaxies: individual (3C 66A)</subject><subject>galaxies: jets</subject><subject>GHZ RANGE</subject><subject>Kinematics</subject><subject>OPACITY</subject><subject>PROPER MOTION</subject><subject>radio continuum: galaxies</subject><subject>SPECTRA</subject><subject>VISIBILITY</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqN0U1PwjAYB_DGaCKiX8BTEy9eBn1bX45jDsFMQRgmeGlG6eIIsLmOg9_eIQYvxnjqk-bXJ0__DwDXGHUwkrKLEGIeJz7vYqa6pMv4CWhhn0qPSolPQesIzsGFcyuEMJaItcD0cRYnQy8aj8IBPNT9SfQ8i57COXyJe0M4TWZ3czjqw2QQwXEwmUahNw2DOIIPUQKHT1_3vTh4DSaQhpDz4BKcZena2avvsw1m_SgJB148uh82Lz3DfFJ7QrAFpSZVgltLU07lIhPCZso3HCHfZoItpUglUz5lFjOZmuYDkkvFfYwYpm1wc-hbuDrXzuS1NW-m2G6tqTUhlBFMVaNuD6qsiveddbXe5M7Y9Trd2mLnNBYCUSaV-g-lvsKEK9lQcqCmKpyrbKbLKt-k1YfGSO9XoveJ633iulmJJprxn4HzotSrYldtm3h0ujoKXS6zRnV-UX-0_QSn6Y1F</recordid><startdate>20150201</startdate><enddate>20150201</enddate><creator>Zhao, Guang-Yao</creator><creator>Chen, Yong-Jun</creator><creator>Shen, Zhi-Qiang</creator><creator>Sudou, Hiroshi</creator><creator>Iguchi, Satoru</creator><general>The American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-4417-1659</orcidid></search><sort><creationdate>20150201</creationdate><title>MULTI-EPOCH MULTI-FREQUENCY VLBI STUDY OF THE PARSEC-SCALE JET IN THE BLAZAR 3C 66A</title><author>Zhao, Guang-Yao ; Chen, Yong-Jun ; Shen, Zhi-Qiang ; Sudou, Hiroshi ; Iguchi, Satoru</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c452t-774b33ca976ee3a638bf77ef95c6005ef74d87a849534e148ac62586896510413</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Blazars</topic><topic>Breaking</topic><topic>COSMIC GAMMA SOURCES</topic><topic>Doppler</topic><topic>DOPPLER EFFECT</topic><topic>Flats</topic><topic>GALAXIES</topic><topic>galaxies: individual (3C 66A)</topic><topic>galaxies: jets</topic><topic>GHZ RANGE</topic><topic>Kinematics</topic><topic>OPACITY</topic><topic>PROPER MOTION</topic><topic>radio continuum: galaxies</topic><topic>SPECTRA</topic><topic>VISIBILITY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhao, Guang-Yao</creatorcontrib><creatorcontrib>Chen, Yong-Jun</creatorcontrib><creatorcontrib>Shen, Zhi-Qiang</creatorcontrib><creatorcontrib>Sudou, Hiroshi</creatorcontrib><creatorcontrib>Iguchi, Satoru</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Zhao, Guang-Yao</au><au>Chen, Yong-Jun</au><au>Shen, Zhi-Qiang</au><au>Sudou, Hiroshi</au><au>Iguchi, Satoru</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>MULTI-EPOCH MULTI-FREQUENCY VLBI STUDY OF THE PARSEC-SCALE JET IN THE BLAZAR 3C 66A</atitle><jtitle>The Astronomical journal</jtitle><stitle>AJ</stitle><addtitle>Astron. J</addtitle><date>2015-02-01</date><risdate>2015</risdate><volume>149</volume><issue>2</issue><spage>1</spage><epage>7</epage><pages>1-7</pages><issn>0004-6256</issn><issn>1538-3881</issn><eissn>1538-3881</eissn><abstract>ABSTRACT We present observational results of the γ-ray blazar 3C 66A at 2.3, 8.4, and 22 GHz at four epochs during 2004-2005 with the VLBA. The resulting images show an overall core-jet structure extending roughly to the south, with two intermediate breaks occurring in the region near the core. By model-fitting to the visibility data, the northmost component, which is also the brightest, is identified as the core according to its relatively flat spectrum and its compactness. Combining our results with previous results to investigate the proper motions of the jet components, we found the kinematics of 3C 66A to be quite complicated, with components of inward and outward, subluminal and superluminal motions all detected in the radio structure. The superluminal motions indicate strong Doppler boosting exists in the jet. The apparent inward motions of the innermost components last for at least 10 years and could not be caused by newborn components. A possible reason could be non-stationarity of the core due to opacity change.</abstract><cop>United States</cop><pub>The American Astronomical Society</pub><doi>10.1088/0004-6256/149/2/46</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-4417-1659</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Blazars Breaking COSMIC GAMMA SOURCES Doppler DOPPLER EFFECT Flats GALAXIES galaxies: individual (3C 66A) galaxies: jets GHZ RANGE Kinematics OPACITY PROPER MOTION radio continuum: galaxies SPECTRA VISIBILITY |
| title | MULTI-EPOCH MULTI-FREQUENCY VLBI STUDY OF THE PARSEC-SCALE JET IN THE BLAZAR 3C 66A |
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